Full-parity port of the Slint QConnect integration per the contract at qbz-nix-docs/qt-frontend/2026-08-01-qconnect-port/00-CONTRACT.md (three adversarial review rounds on the spec, §12 trap sign-off PASS on both halves, RFB-verified incl. a real cloud connect, live session owner-tested). The shared crates are consumed verbatim — zero backend changes. - adapter quartet: qconnect_transport_qt (credentials, identity on the shared qconnect_settings.db), qconnect_engine_qt (start_track_stream fallback chain + feeder helpers + CMAF cursor sync), qconnect_event_sink_qt, qconnect_qt (the facade: connect/disconnect recipe, controller routing, echo guards, offline parking B12, startup auto-connect) - QbzQConnect bridge singleton + on_session_entered wiring; one shared flyout for both bars (tooltip on the large bar only), Developer > Connect diagnostics modal, device-row glyphs, settings rows live - poll loop: peer-reflection branch before cast, ~2 s renderer reports, sync-on-add on every Qobuz-castable add path - routing: cast → QConnect → local (mute QConnect-first), play arms after the set_queue funnel, reorder cloud arm with no local fallback, volume/mute/seek remote-first - touchpoints: lyrics remote anchor, scrobble guarded / Discord unguarded, cast suspend/resume, volume-lock lifted when remote km
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322 B